Dissertations and Theses @ UNI

Availability

Open Access Thesis

Keywords

Ductile iron -- Effect of temperature on; Iron -- Effect of temperature on;

Abstract

Low temperature treatment, as a method of improving mechanical properties of metals, has been studied and used for well over 60 years. Until recently these treatments have been limited to hardness and wear improvements of high alloy irons and steels. The purpose of this research is to determine the effects of refrigeration and cryogenic treatments on the mechanical properties, including hardness and tensile strength of austempered ductile iron.

This research included the production of a high strength ductile iron of low alloy content capable of being used in either the as cast, conventionally heat treated or austempered condition. Refrigeration and cryogenic treatments were applied to the material at different points within the production cycles to determine the most effective order of treatment. After production of the base material at the university, representative specimens were treated by a series of sub-zero temperatures and austempering cycles at commercial treatment facilities. These specimens were then returned to the university and were subjected to a series of mechanical tests that included tensile and hardness property testing.

After analysis of the data, it was determined that the greatest effects on the iron were in the increase in hardness and tensile strength of samples that had been cryogenically treated and after undergoing a commercial austempering cycle. Tensile and hardness properties of the material were increased approximately 16% over the nontreated samples. The study concluded that cryogenic treatment of austempered ductile iron is possible, and that it may have benefits over conventional hardening methods by preserving the surface _quality of machined components.

Year of Submission

1996

Degree Name

Master of Arts

Department

Department of Industrial Technology

First Advisor

Mohammed Fahmy

Comments

If you are the rightful copyright holder of this dissertation or thesis and wish to have it removed from the Open Access Collection, please submit a request to scholarworks@uni.edu and include clear identification of the work, preferably with URL.

Date Original

1996

Object Description

1 PDF file (70 pages)

Language

en

File Format

application/pdf

Download

Comments?

Share

COinS